I am on Apple iPad and I haven't got that option in settings to delete those pictures. Does anyone know if there is another way to delete them?Just to say: those random large pictures can be removed just by unselecting Show Photo Preview under the settings option. They really spooked me at first, but it's fine now.
Everyone who is getting those random number that you can't clear: are you all on the apple app? I'm on android and do not see them.